These are all parameters that influence the noise characteristics of an AA instrument and thus affect the limit of detection. By understanding these parameters, the technician can properly optimize the AA instrumentation. For example, the technician should understand:

• the different types and characteristics of AA sources (hollow cathode lamp (HCL) and electrodeless discharge lamp (EDL)) and how their stability and intensity affects the AA measurements. They should know why elements such as Hg, As and Se require an EDL for optimum measurement capability.
• the different types of AA flames and how stability and stoichiometry affect measurement sensitivity. They should understand the relationship of stoichiometry and flame temperature to atom formation.
• the effect of slit width and wavelength on the AA measurement. The should be able to determine which elements require narrow slit widths for optimum sensitivity.